Arc lamp



ec .'17,1935. A ENH T- 2,024,318

ARC LAMP Filed March 4, 1931 4 Sheets-Sheet l Dec. 17,1935. H} WAGENHORST 2,024,318

ARC LAMP Fi led March 4, 1951 4 Sheets-Sheet 3 @lmzsma momg Dec.17,1935. J GENH R T I "2,024,318

ARC LAMP Filed March 4, 1931 4 Sheets-Sheet 4 Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE 17 Claims.

My invention relates to improvements in arc lamps, for instance, of the type disclosed in my Patent 1,816,554, granted July 28, 1931, and has to do, more particularly, with the efficient control of automatically fed movable electrodes in such lamp construction.

It is a primary object of my invention to provide a simple, inexpensive arc lamp construction which will provide an arc of uniform intensity.

It is also an object of my invention to provide means for guiding the movable electrodes of such a lamp and maintaining them in alinement with the cooperating stationary electrodes, which means is of such character that friction is greatly reduced, thus rendering the electrode operating means extremely sensitive to fluctuations in the current and giving a steady light of substantially constant value.

Another object of my invention is to provide a clutch mechanism for grasping electrode control rods, which will release at a fraction of the variation in current necessary to effect release in heretofore known tilt-plate clutch constructions.

A further object of my invention is the provision, in an arm lamp employing a plurality of electrodes attached to two or more control rods grasped by a single clutch, of means insuring equal clutching of said control rods.

A still further object of my invention is the provision, in an arc lamp having an apertured base and an electrode movable through the aperture in the base, of means snugly engaged about the electrode, and laterally movable upon the base, to prevent the passage of dirt or fumes through said aperture.

Further objects, and objects relating to details and economics of construction and operation, will definitely appear from the detailed description to follow. In one instance, I accomplish the objects of my invention by the devices and means set forth in the following specification. My invention is clearly defined and pointed out in the appended claims. A structure constituting a preferred embodiment of my invention is ilustrated in the accompanying drawings, forming a part of my specification, in which,-

Figure 1 is a central, vertical sectional view through an arc lamp embodying my invention;

Fig. 2 is a transverse, vertical, sectional view through the lamp;

Fig. 3 is a horizontal, sectional view taken on th line 33 of Fig. 1;

Fig. 4 is a detail sectional view taken on the line 4-4 of Fig. 3;

Fig. 5 is a fragmentary sectional view taken on 9 the line 5-5 of Fig. 3, through the electrode encircling plate and the lamp base, showing the securing pin construction and association;

Fig. 6 is a detail view of the pin construction shown in Fig. 5, the plate and the upper portion 5 of the pin being removed to show the loose relation of the pin in the aperture of the base;

Fig. 7 is a fragmentary sectional view showing the aperture relationship of the clutch, control rods and clutch-tripping means;

Fig. 8 is a perspective view of the clutch and clutch-tripping means disclosed in Fig. 7;

Fig. 9 is a top plan view of the solenoid and solenoid core shown in Fig. 1;

Fig. 10 is a vertical, sectional view through the solenoid and core shown in Fig. 1;

Fig. 11 is a detail view, in perspective, of adjacent laminae to be associated as a part of the solenoid core shown in Figs. 9 and 10;

Fig. 12 is a detail view, in perspective, of a T- 29 shaped lamina which may be used in a core construction similar to that shown in Figs. 9 and 10.

Fig. 13 is a vertical sectional view of a solenoid and a modified form of core comprised by U- shaped laminae; and

Fig. 14 is a detail view, in perspective, of one lamina of the core shown in Fig. 12.

In the drawings, the same reference characters refer to the same parts throughout the several views.

In general, my invention comprises the incorporation, in an arc lamp of the general type disclosed in my Patent No. 1,816,554, previously referred to, of novel electrode operating means. Broadly, these means are disclosed in my copending application, Serial No. 439,725, filed March 28, 1930, in which application the claims are limited to novel features of easing structure. In so far, therefore, as the present application discloses and. claims electrode operating mechanism disclosed in said earlier and copending application, the present application is a continuation thereof. In a broad aspect, the present invention, disclosed and claimed, consists in the incorporation, in an arc lamp of the general type disclosed in my aforementioned Patent No. 1,816,554, of means for maintaining the electrodes and electrode control rods in alined, substantially frictionless association cooperating with novel clutch means for appropriately and, if necessary, differentially feed- 50 ing said electrodes through the medium of said control rods. More specifically, the clutch comprises a tiltable plate suspended from one end by the lever and having an aperture through which the control rods extend and are grasped to properly space the arcing ends of the electrodes. Means are provided on the free end of the clutch plate which contact with the lamp base or other stop and cause the plate to be easily disengaged from the control rods and permit them and their attached electrodes to lower sufficiently to compensate for electrode consumption. It is very desirable in a sensitive lamp of this character to exclude heat, dirt, and fumes from the operating mechanism. For this reason, a partition or lamp base is generally provided upon which the mechanism is supported, and through which the" movable electrodes extend and are fed into arcing relation with the stationary electrodes supported therebeneath. Although electrodes are generally of uniform diameter, they frequently are not absolutely straight. Further, in a lever type of lamp such as disclosed, there is a slight, but material amount of lateral movement of the electrodes as the lever passes from the horizontal to an inclined position. For these reasons, as well as the tolerance required in mass production, clearance must be provided by making the apertures in the base considerably larger than the electrodes which pass therethrough. Heat, fumes, and some solid matter pass through the resultantgaps and the sensitive mechanism becomes subject to their deleterious effects. With this in mind, my invention contemplates means for sealing said apertures against the passage therethrough of heat and foreign matter, without, however, interfering with the desired sensitivity and smoothness of action inherent to the present operating mechanism.

Referring to the numbered partsof the drawings, in which I have disclosed a preferred embodiment of my invention, I provide a casing II in which the arcs are drawn, centrally supported by a tubular standard It. Upon the top l3 of the casing, which also serves as the base for the operating mechanism, is mounted a housing 14 within which the lamp operating mechanism is enclosed. Mounted within the housing is a solenoid coil 15 into which the trunk of the solenoid cor-e l6 depends. The core comprises a plurality of inverted L-shaped laminae [5a, alternately arranged with their upper arms lfib extending in opposite directions and bent to form a fan-like series of radially extending vanes, as shown in Fig. 9. As shown in Fig. 12, the core may be made up from a plurality of laminations 66a of T form, having oppositely extending upper arms 6%. In the modification shown in Fig. 13, the solenoid core is of vane-- like construction, similar to that shown in Figs. 9 and 10, but the vanes not only radiate across the top of the coil element I5 but also extend downwardly and nearly enclose the ,coil 65. In this form, even greater efficiency is to be had by reason of the larger surface exposed to the magnetic attraction of the coil l5. The core i6 is preferably made up from lamina 16a of the inverted U shape shown in Fig. 14 having radially extending arms 15b and arms 15c extending downwardly therefrom. As in the case of the core shown in Figs. 9 and 10, the lamina lea may be formed with arms extending in opposite directions. A core of the type shown in Fig. if thus constituted, would consist of a plurality of laminae having together the form of an inverted W.

An operating lever 13 is pivotally mounted upon a pivot shaft I5 supported upon a wall of the housing. From one arm of the lever it depends a spring link if to which the upper end of the solenoid core i6 is attached. From the other ar of the lever, adjacent its extremity, depends a link to which a dashpot cylinder 2| is attached.

The dashpot piston 22 is supported from the base it of the lamp by a short rod 23. Anchored in said lever arm at a point intermediate the pivot shaft is and the dashpot link 25, is a pivot pin 24, upon the forward end of which is supported the bight portion of a U-shaped pair of control tube guide members 25. Said guide members depend with their lower ends terminating in a disc 25 which is snugly fitted, but freely slidable, vertically, in the tubular standard l2. each guide member 25 is a control rod 21 preferably of hollow or tubular form having attached to its upper end, a laterally extending apertured lug 23. Fastened to each lug by a bolt 29, and insulated therefrom by a strip of insulation, is a clamp for holding one or more movable electrodes 32 which depend through apertures 33 in the base is into arcing relation with stationary electrodes 35. Electrodes 3d are firmly supported from standard l2 by a pair of clamps 35, 36, electrically insulated" om each other and, from the standard l2. A backing plate 3'! of comparatively thick fire-resistant material is preferably attached, as by bolts 33, to the under side of the base it for the purpose of reinforcement and added 11 support. It is provided with large apertures alined with apertures 33 of the base l3, through which the movable electrodes 32 pass freely.

Disposed upon the top surface of the base l3 and provided with apertures through which the movable electrodes pass snugly but without appreciable resistance, are plates 39 of a material such as asbestos board, which is a non-conductor of electricity and'is not subject to injury or deterioraticn by prolonged exposure to heat. plates are preferably provided one for each movable electrode, and are held upon said base 13 against vertical movement, yet are capable of considerable movement in a horizontal plane. In

the preferred embodiment shown, the holding devices for the plates comprise pins 50 and 4 I. Pins 49 fit tightly in apertures 42 provided in the base 13 and backing plate 3'1, and each plate 39 1'5 snugly mounted for pivotal movement about a pinAZ apertures in the base and backing plate, permitting considerable lateral movement of the plate relative to the base at this point. Thus, plates 39 are held against vertical displacement from the base i3 at two sides of the electrode,

without, however, interfering with their normal lateral movement in conformity with lateral movement of the electrodes Heads are provided upon the ends of said pins, those in the disclosed embodiment being constituted by right angularly bent extensions 513a and Aila which bear against the top surface of the plates, and 48b and 4 lb which bear against the under side of the backing plate 31. In the disclosed embodiment, pins are constituted by a single uwhaped piece of stout wire, the pins d9 having a common head portion lfib which bears against the under side of the plate 31. If pins 49 with such or other forms of extensive heads are used, and the plates 38 are well fitted to the electrodes, pins 4i may omitted in the interests of economy.

The clutch mechanism includes a connecting rod 44 pivotally mounted at its upper end upon the pin 24. The lower end of the rod is bent into a bight portion 45 extending through the clutch plate 41 and terminates in an arm 48 which extends toward the control rods 27 and overlies a portion of the clutch plate 51. Clutch plate 41.

pivotally supported at one end upon the bight portion Q5 and its other end is prevented from Disposed about These Pins 6 l, in distinction, pass through large assuming an elevated position by the arm 46 which overlies a substantial portion of the plate. False clutching is thereby prevented. A substantially heart-shaped aperture 48 is provided in the clutch plate 41 and two edges of the aperture are convergent toward the suspended end of the plate so that, when the plate is in a tilted position, the control rods 21 extending therethrough are wedged together into frictional engagement with each other. The control rods 21 are preferably knurled or serrated as at 48 along the line of contact so that when clutched or declutched by plate 41 they will normally move together as a unit, except to compensate for uneven consumption of the electrodes. The end of the clutch plate not suspended upon the rod 44 is drilled transversely to provide a bearing 50 for the clutch-plate tripping element 53. By the use of this element, the sensitivity of the lamp to variations in current demand due to electrode consumption is increased as much as eight fold. The clutch plate tripping element disclosed is formable from a single piece of common brass rod and comprises a pintle portion 5| disposed in bearing 55 of the clutch plate. A contactor arm 52 extends forwardly from one end of the pintle 5| and terminates in a bight portion 52a. which bears against the base I3, or other stop, when the lamp is either not in operation, or the electrodes require feeding to compensate for their consumption and the clutch operating arm of the lever l8 has reached substantially the limit of its downward movement. A second arm 53 extends rearwardly from the other end of the pintle 5! and terminates in a finger portion 53a which overlies arm 46. Upon a lowering of the clutch plate 41 with the portion 52a of the contac 'or arm resting against the base 13, the plate 41 is caused to progressively approach the horizontal. This progressive movement is far more steady, easy, sensitive, and certain than that occurring in a construction in which the free end of the clutch plate bears directly upon the base. The present movement is eiiected by the compound lever action involving pivotal movement of the pintle 5! in the bearing 50 and pivotal movement of the finger portion 53a upon the arm 46, as well as pivotal movement of the clutch plate 41, upon the bight portion 45. By reason of the fact that a portion of the pull of clutch rod 44 is taken from the normally suspended end of the clutch plate and transferred through arms 45 and 53 to the normally free end of the plate there occurs an actual lifting of the free end as well as a lowering of the normally suspended end. When the clutch plate has so nearly reached a horizontal plane that the effective horizontal orifice of the aperture permits the control rods to fall, they do so, and the movable electrodes 32 advance to compensate for the portion of the electrodes consumed since the previous release of the clutch plate 41. However, the advance of the movable electrodes brings about an immediate increase in the current by reason of the shortened arc, and the solenoid coil which is in series with the lamp circuit responds, drawing down the core I5, rocking the lever 18, lifting the clutch rod 44 and the clutch plate 4! free or the base l3, causing it to engage the control rods 21, lifting them and their attached movable electrodes 32, spacing the arcs and bringing the lamp again into equilibrium. The action above described is so instantaneous that the arc is not interrupted and the intensity of the light therefrom is substantially uniform.

The electrical connections of the lamp are conventional, the line 54 being provided with a switch 55. One conductor 56 therefrom connects to stationary electrode clamp 35, the current passing through the stationary electrode supported therein and its arc to the associated movable electrode, the clamp 3| thereon, and through conductor 51 to the series resistance 58. From the series resistance by conductor 59, the current passes through solenoid core l5, thence through conductor 60 to the other clamp 3|, its movable electrode, the second arc, the stationary electrode in clamp 36, said clamp, and conductor 6| to the switch 55 and line 54.

It will be observed that I have provided a simple, inexpensive arc lamp which is far more sensitive to electrode consumption than those heretofore provided. This is a feature of the highest importance when such a lamp is employed for light therapy, since, unless the light intensity be uniform, the exposure can not be determined in units of time. It is well known that the proper amount of exposure is to be accurately determined from the character and condition of the patient or subject, and the secret of success in light therapy is chiefly one of strict adherence to the exposure prescribed. Irregular treatments and undetermined amounts of exposure to are lamp emission may not only be of no value, but mayeven be seriously injurious. The present lamp, because of its simple, inexpensive, and trouble-free character, has special appeal for the home and school, and, because of the uniform intensity of the light provided thereby, is a safe lamp which can be scientifically employed by anyone who can tell time.

The solenoid core disclosed, by reason of the novel fan-like character of its upper portion, is less subject to heating by eddy currents, is cooler by reason of its greater radiating surface, and provides a greater amount of pull without increased weight because more magnetic lines of force are included therein.

The peculiar sealing plates disposed about the movable electrodes exclude heat, fumes, and solid matter from the mechanism housing ensuring trouble-free operation of the lamp without inter- L ference with its sensitivity or smoothness of operation.

I am aware that many of the features of this invention are applicable to lamps employing a single pair of electrodes. I am also aware that the particular construction illustrated in this application may be changed considerably without departing from the spirit of my invention. Therefore, I claim my invention broadly, as indicated by the appended claims.

What I claim is:

1. In an arc lamp, an electrode a second electrode movable and normally urged to contact with said first electrode, a wall having an aperture through which said movable electrode extends, clutch means including a tiltable plate for controlling said movable electrode, regulating means normally exerting a pull upon one end of said plate tilting and retracting same to dispose said ecoming operative through which said movable electrode extends, clutch means including a tiltable plate for controlling said movable electrode, regulating means normally exerting a pull upon one end of said plate tilting and retracting same to dispose said movable electrode in uniform arcing relation with said first electrode, and a lever carried by and pivoted to said clutch plate at a point remote from said end, said lever having an arm engageable with said wall and another arm engageable with said regulating means to effect release of said clutch and allow said movable electrode to advance, said lever means becoming operative only upon a decrease in arc intensity due to .uncompensated consumption of the electrodes.

3. In an arc lamp, an electrode, a second electrode movable and normally urged to contact with said first electrode, a wall having an aperture through which said movable electrode extends, clutch means incllrding a'tiltable plate for controlling said movable electrode, regulating means normally exerting a pull upon one end of said plate tilting and retracting same to dispose said movable electrode in uniform arcing relation with said first electrode, and a lever carried by and pivoted to the other end of said clutch plate, said lever having an arm engageable with said wall and another arm engageable with said regulating means to effect release of said clutch and allow said movable electrode to advance, said lever means becoming operative only upon a decrease in arc intensity due to uncompensated consumption of the electrodes.

4. In an arc lamp, an electrode, a second electrode movable and normally urged to contact with said first electrode, a stop member, clutch means including a tiltable plate for controlling said movable electrode, regulating means normally exerting a pull upon one end of said plate, tilting and retracting same to dispose said electrode in uniform arcing relation with said first electrode, and a lever carried by and pivoted to said clutch plate at a point remote from said end, said lever having an arm engageable with said stop member and another arm engageable with said regulating means to effect release of said clutch and allow said movable electrode to advance, said lever means becoming operative only upon a decrease in arc intensity due to uncompensated consumption of the electrodes.

5. In an arc lamp, the combination of a suspended member, a clutch plate embracing said member, a suspension member connected to the end of said plate remote from the suspended member, a lever fulcrumed on said plate and having one arm adapted to bear on said suspended member, and a stop adapted to be engaged by another arm of said lever to tilt said plate to release position.

6. In an arc lamp, the combination of a suspended member, a clutch plate embracing said member, a suspension rod having at its lower end a reversely bent portion extending upwardly through the portion of said plate remote fromthe suspended member, and an arm extending laterally therefrom and overlying said plate, a lever fulcrumed on said plate and having one arm adapted to bear on said arm of the suspension rod, and a stop adapted to be engaged by the other arm of said lever to tilt said plate to release position.

'7. In an arc lamp, the combination'of a sus pended member, a clutch plate embracing said member, a suspension rod having at its lower end a reversely bent portion extending upwardly through the portion of said plate remotefrom the suspended member, and an arm extending laterally therefrom and overlying said plate, a lever fulcrumed on said plate and having one arm adapted to bear on said arm of the suspension rod between the suspended member and the remote end of the plate, and a stop adapted to be engaged by the other arm of said lever to tilt said plate to release position.

8. In an arc lamp, the combination of a suspended member, a clutch plate embracing said member, a suspension rod having at its lower end a reversely bent portion extending upwardly through the portion of said plate remote from the suspended member, and an arm extending laterally therefrom and overlying said plate intermediate said remote portion of said plate and the suspended member, a lever fulcrumed on said plate and having one arm adapted to bear on said arm of the suspension rod between the suspended member and the remote end of the plate, and a stop adapted to be engaged by the other arm of said lever to tilt said plate to release position.

9. In an arc lamp, a spaced pair of stationary electrodes, a lamp base, a spaced pair of individually movable electrodes extending through apertures in said base and normally urged to contact with said stationary electrodes, a control rod attached to each movable electrode, said control rods being disposed in side-by-side relation and extending through an aperture in said base, an apertured clutch plate tiltable to grasp said control rods, regulating means normally exerting a pull upon one end of the clutch plate'to cause same to grasp the control rods and retract said movable electrodes into uniform arcing relation with said stationary electrodes, and means carried by said clutch plate for transferring a portion of the pull of said regulating means to the opposite end of said clutch plate to effect its release and allow said control rods and movable electrodes to advance, said last-mentioned means becoming operative only upon a decrease in arc intensity due to uncompensated consumption of the electrodes.

10. In an arc lamp, a spaced pair of stationary electrodes, a lamp base, a spaced pair of individually movable electrodes extending through apertures in said base and normally urged to contact with said stationary electrodes, a control rod attached to each movable electrode, said control rods being disposed in side-by-side relation and extending through an aperture in said base, an apertured clutch plate tiltable to grasp said control rods, regulating means normally exerting a pull upon one end of the clutch plate to cause same to grasp the control rods and retract said movable electrodes into uniform arcing relation with said stationary electrodes, and a lever carried by and pivoted to said clutch plate at a point remote from said end, said lever having an arm engageable with said base and another arm engageable with said regulating means to efiect release of said clutch and allow said control rods and movable electrodes to advance, said lever means becoming operative only upon a decrease in arc intensity due to uncompensated consumption of the electrodes.

11. In an arc lamp, a spaced pair of sta- T tionary electrodes, a lamp base, a spaced pair of individually movable electrodes extending through apertures in said base and normally urged to contact with said stationary electrodes, a control rod attached to each'movable electrode, said control rods being disposed in sideby-side relation and extending through an aperture in said base, an apertured clutch plate tiltable to grasp said control rods, means responsive to variations in the current passing through said lamp, a rod connecting said current responsive means to one end of said clutch plate to cause same to tilt, grasp, and retract the control rods to provide arcs of uniform intensity between the electrodes, said rod having an extension overlying the clutch plate, and a lever carried by and pivoted to said clutch plate at a point remote from said end, said lever having an arm engageable with the lamp base and another arm engageable with the extension of said connecting rod to eifect disengagement of said clutch plate from said control rods allowing said movable electrodes to advance, said lever means becom ing operative only upon a decrease in arc intensity due to uncompensated consumption of the electrodes.

12. In an arc lamp, a spaced pair of stationary electrodes, a lamp base, a spaced pair of individually movable electrodes, a control rod attached to each movable electrode, an apertured clutch plate disposed about and tiltable to grasp said control rods, a solenoid, an operating lever actuated by said solenoid, a rod pivotally attached at one end to said lever and at its other end to one end of said clutch plate, an extension on said rod overlying said clutch plate, a lever pivoted upon the other end of said clutch plate and having one arm which extends inwardly and is engageable with said rod extension and another arm which extends outwardly from said clutch plate, and a stop with which said outwardly extending lever arm is engageable to cause said clutch plate to release said control rods and allow the movable electrodes to advance.

13. In an arc lamp having a pair of electrodes, one of which is fed into arcing relation with the other, means for controlling said feeding comprising a tiltable clutch plate and means for lifting one end of said plate to eifect tilting thereof to clutching position comprising: means responsive to the current passing through the electrodes, means connected at one end with said current-responsive means and consisting of a rod member formed of wire stock, having an intermediate looped portion adjacent its other end pivotally journaled in one end of said tiltable plate, and having its terminal portion closely overlying said plate at a point inward of its journaled end preventing the other end of said plate from assuming a position above the end of said plate journaled upon said connecting means and thus precluding false clutching.

14. In an arc lamp, an electrode, a second electrode movable and normally urged to contact with said first electrode, and means for maintaining said second electrode in uniformly-spaced arcing relation with said first electrode, said means including a tiltable clutch member for restraining movement of said second electrode toward said first electrode, regulating means exerting a pull primarily upon one side only of said clutch member, effecting tilting of said member into clutching relation by maintaining said side retracted with respect to the opposite side, and means transferring a portion of the pull of said regulating means from the retracted side of said clutch member to the opposite side thereof,

reducing its inclination and effecting feeding of said second electrode toward said first electrode compensatory of electrode consumption by the arc.

15. In an arc lamp, an electrode, a second electrode movable and normally urged to contact with said first electrode, and means for maintaining said second electrode in uniformly-spaced arcing relation with said first electrode, said means including a tiltable clutch member for restraining movement of said second electrode toward said first electrode, regulating means exerting a pull primarily upon one side only of said clutch member, effecting tilting of said member into clutching relation by maintaining said side retracted with respect to the opposite side, and lever means carried by said clutch member and transferring a portion of the pull of said regulating means from the retracted side of said clutch member to the opposite side thereof, reducing its inclination and effecting feeding of said second electrode toward said first electrode compensa tory of electrode consumption by the arc.

16. In an arc lamp, an electrode, a second electrode movable and normally urged to contact with said first electrode, and means for maintaining said second electrode in uniformly-spaced arcing relation with said first electrode, said means including a tiltable clutch member for restraining movement of said second electrode toward said first electrode, regulating means exerting a pull primarily upon one side only of said clutch member, effecting tilting of said member into clutching relation by maintaining said side retracted with respect to the opposite side, and means for reducing the inclination of said clutch member and effecting feeding of said second electrode toward said first electrode compensatory of electrode consumption by said arc, said means comprising a lever carried by and pivoted to said clutch member at a point inward of its retracted side, said lever having a pair of arms one of which is engageable with said regulating means, and a stop against which the other of said arms may bear, thereby efiecting engagement of said first mentioned arm with said regulating means and the transfer of a portion of the pull of said regulating means to said clutch member at a point inward of its retracted side.

17. In an arc lamp, an electrode, a second electrode movable and normally urged to contact with said first electrode, and means for maintaining said second electrode in uniformly-spaced arcing relation with said first electrode, said means including a tiltable clutch member for restraining movement of said second electrode toward said first electrode, regulating means exerting a pull primarily upon one side only of said clutch member, effecting tilting of said member into clutching relation by maintaining said side retracted with respect to the opposite side, and means for supporting the unretracted side of said clutch member to release the same and effect feeding of said second electrode compensatory of electrode consumption by the arc, said means comprising a stop member and a member carried by the unretracted side of said clutch member and engageable with said stop and said regulating means for distributing the support of the unretracted side of said clutch member therebetween.

JAMES H. WAGENHORST. 

